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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '46f5a9746e40cf1aef3bff6f691a0351d5e2f573fc8f5bcedf152a5caa3087ff' 
  AND token = '+A1E6DDvUstQlT8N/cB72Eq4nfB+CA5roOEaf7ETbZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}